Calculation of Additional Turbulent Force by Slicing Method for Underwater Unpowered Vehicle under Layered Ocean Current
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摘要: 由于海流的复杂性, 在水下无动力运载器的弹道计算中, 仅以恒定海流速度求解其附加扰动力的常规方法存在较大误差, 影响了运载器的出水姿态。本文在用计算流体力学(CFD)方法求得其流体动力无因次系数的基础上, 采用切片法计算得到运载器的附加扰动力。并对两种方法在均匀海流和分层海流两种情况下附加扰动力的计算结果进行了比较, 结果表明, 均匀海流下两种方法的计算结果一致, 而在分层海流下, 若选择合适的切片数, 使用切片法的计算结果比常规方法要精确。Abstract: Conventional additional turbulent force calculation method based on constant ocean current velocity introduces large error in the trajectory calculation of an underwater unpowered vehicle due to complexity of ocean current, which influences the vehicle attitude of water outlet. This paper calculates the additional turbulent forces of the vehicle by using the slicing method based on the non-dimensional hydrodynamic coefficient obtained with CFD method, and compares the forces with the ones from conventional method under even ocean current and layered ocean current. Conclusions are drawn that the results obtained with both conventional and slicing methods are consistent with each other under even ocean current, while the slicing method can achieve more accurate result under layered ocean current by selecting proper slicing number.
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